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Subject[PATCH 4/9] Blackfin SPI driver: prevent people from setting bits in ctl_reg
Date
From: Mike Frysinger <michael.frysinger@analog.com>

Prevent people from setting bits in ctl_reg that the SPI
framework already handles, hopefully we can one day drop
ctl_reg completely

Signed-off-by: Mike Frysinger <michael.frysinger@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
---
drivers/spi/spi_bfin5xx.c | 10 ++++++++++
1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c
index 7093065..1a83656 100644
--- a/drivers/spi/spi_bfin5xx.c
+++ b/drivers/spi/spi_bfin5xx.c
@@ -996,6 +996,16 @@ static int setup(struct spi_device *spi)

/* chip_info isn't always needed */
if (chip_info) {
+ /* Make sure people stop trying to set fields via ctl_reg when they
+ * should actually be using common SPI framework. Currently we let
+ * through: WOM EMISO PSSE GM SZ TIMOD. Not sure if a user actually
+ * needs/uses any of these, but let's assume (for now) they do.
+ */
+ if (chip_info->ctl_reg & (SPE | MSTR | CPOL | CPHA | LSBF | SIZE)) {
+ dev_err(&spi->dev, "do not set bits in ctl_reg that the SPI framework provides\n");
+ return -EINVAL;
+ }
+
chip->enable_dma = chip_info->enable_dma != 0
&& drv_data->master_info->enable_dma;
chip->ctl_reg = chip_info->ctl_reg;
--
1.5.3.4
-
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